From: null@void.com   
      
   > A bit earlier, in case you didn't watch the whole video, is another   
   > crusher but for larger material https://youtu.be/hXYrfnFP-jc?t=445 .   
      
   Jaw-crusher.   
   More specifically - a single-toggle jaw crusher.   
   On granite (hard, abrasive), apparently has about 13X the jaw wear of a   
   double-toggle   
   jaw-crusher.   
   Motion of single-toggle jaw-crusher (eccentric at top on which jaw is   
   directly mounted - as see in video) is mixture of crushing and shear.   
   the jaw moves in an approximately elliptical motion.   
   Productive for softer rocks, apparently.   
   Double-toggle - the eccentric is behind the moving jaw, the top of the   
   jaw pivots on a shaft, and the motion is pure compressive "in-and-out".   
      
   We have a miniature jaw crusher - a laboratory jaw-crusher - which we   
   use to break-up what is readily produced by lump-hammers.   
      
   The rod-mill takes-over after the jaw-crusher and is considered   
   "grinding" activity (crushing=>grinding - both are "comminution").   
   Taking the crushed chippings down to a uniform "sand".   
      
   Best wishes,   
   Rich S.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)